Rancho RS994377 RS9000XL Front Shock Stock Height Silverado Sierra 2500HD 3500HD

Vehicle Fitment

• 2011-2025 Chevrolet Silverado 2500HD (WT, LT, LTZ, High Country, Custom) - 2WD and 4WD, Front, Stock Height
• 2011-2025 Chevrolet Silverado 3500HD (WT, LT, LTZ, High Country) - 2WD and 4WD, Front, Stock Height
• 2011-2025 GMC Sierra 2500HD (Base, SLE, SLT, AT4, Denali) - 2WD and 4WD, Front, Stock Height
• 2011-2025 GMC Sierra 3500HD (Base, SLE, SLT, AT4, Denali) - 2WD and 4WD, Front, Stock Height
• Engines: 6.0L V8 (gas), 6.6L V8 (gas), 6.6L V8 Duramax Diesel (LML, L5P)

Fitment Notes

• Front position only. Sold individually - order two for a complete front shock replacement.
• Compatible with both 2WD (RWD) and 4WD configurations across all applicable trims.
• Stock ride height (0 inch lift) application only. A different shock is required for lifted configurations.
• Replaces legacy Rancho part number RS999377 - direct 4th-generation upgrade with integrated bottom mounts and dual component 2K paint finish.
• Not for use with aftermarket shock spacers or relocation brackets.

Features

• 9-position adjustable damping knob delivers precise front ride control from soft daily-driver comfort to firm towing and off-road performance - adjustable by hand without tools.
• 4th-generation RS9000XL design features integrated bottom mounts for enhanced structural strength over previous-generation welded mounts.
• Dual component 2K paint finish provides superior chip resistance and long-term corrosion protection over the legacy liquid metallic coating.
• Large 2.75-inch tri-tube body with all-weather fluid operates cooler and delivers consistent damping under sustained heavy-duty towing, hauling, and payload loads.
• 18mm nitro-carburized piston rod resists scuffing and corrosion for long-term durability across the demanding 2500HD/3500HD application range.
• Nitrogen gas pressurization minimizes air-to-oil mixing to prevent damping fade during extended towing, job site, or off-road use.
• Graphite-filled Fluon-banded 1.25-inch sintered iron piston reduces internal friction for smoother, more responsive damping across all 9 settings.

Specifications

• Position: Front (Left or Right)
• Lift Range: Stock Height (0 inches)
• Damping Adjustment: 9-Position Manual Knob
• Shock Body: 2.75 in. Tri-Tube, All-Weather Fluid
• Piston Rod: 18mm Nitro-Carburized
• Piston: Graphite-Filled Fluon-Banded, 1.25 in. Sintered Iron
• Gas Charge: Nitrogen
• Finish: Dual Component 2K Paint (Liquid Metallic Silver)
• Bottom Mount: Integrated (4th-Generation)
• Drivetrain: 2WD and 4WD
• Operating Temperature Range: -40°F to 248°F
• Sold: Individually
• Warranty: Rancho Limited Lifetime Warranty
• Replaces: RS999377 (Legacy Part Number)

Included Components

• 1x Rancho RS994377 RS9000XL Front Shock Absorber
• 1x Polyurethane Bushing Set
• 1x Protective Polyvinyl Shock Boot
• 1x Hardware Pack (washers, bushings, and nuts)

Product Description

The Rancho RS994377 is the 4th-generation RS9000XL front shock absorber for 2011-2025 Chevrolet Silverado 2500HD and 3500HD, and GMC Sierra 2500HD and 3500HD trucks at stock ride height, directly replacing the legacy RS999377. Compatible with both 2WD and 4WD configurations across all gasoline and Duramax diesel engine applications, it is purpose-built for the heavy-duty demands of the HD truck platform - delivering consistent front damping performance under maximum payload, repeat towing loads, and job site use. The 4th-gen design brings integrated bottom mounts for improved structural rigidity and a dual component 2K paint finish that outperforms the previous liquid metallic coating in chip and corrosion resistance.

The 9-position manually adjustable damping knob allows HD truck owners to dial in front ride quality from soft and comfortable for empty highway driving to firm and controlled for maximum GVWR towing or loaded off-road runs - all without tools. The large 2.75-inch tri-tube body, nitrogen gas charge, and 18mm nitro-carburized piston rod maintain consistent performance across the extended service life expected of heavy-duty work and towing applications. Sold individually - two are required for a complete front replacement.